Section 21Republic Act No. 265 as amended;, Sec./Art. 21

"Tax credit" shall mean any of the credits against taxes and/or duties equal to those actually paid or would have been paid to evidence which tax credit certificate shall be issued by the Secretary of Finance or his representative, or the Board, if so delegated by the Secretary of Finance. The tax credit certificates including those issued by the Board pursuant to laws repealed by this Code but without in any way diminishing the scope of negotiability under their laws of issue are transferable under such conditions as may be determined by the Board after consultation with the Department of Finance.

The tax credit certificate shall be used to pay taxes, duties, charges and fees due to the National Government; Provided, That the tax credits issued under this Code shall not form part of the gross income of the grantee/transferee for income tax purposes under Section 29 of the National Internal Revenue Code and are therefore not taxable: Provided, further, That such tax credits shall be valid only for a period of ten (10) years from date of issuance.